argp fixes for some size-calculation overflows

[Ulrich Drepper]

Paul Eggert wrote:

> Here are proposed patches.  They are relative to gnulib but also apply
> cleanly to glibc.

I doubt that this ever will be a problem (since the kernel would have to
pass up that many parameters) but since you've cooked up the patches
I've checked them in.  They won't make things worse.  Thanks,

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